CSS: Clean up memory leak in reliableMarginRight

Fixes gh-1795
Closes gh-1893

Thanks for the report flexphperia!
(cherry picked from commit 7d15b4d1f181de8868c375c545a51e4dfc28a611)

Conflicts:
	src/css/support.js
Manipulation: support data-URI scripts insertion

Ref 15f4dec7894f1e00adbfb9bce4f870441a527bd6
Manipulation: don't test data-URI with script element in IE8

Since, apparently, it doesn't support it. Couldn't find more relevant info
then this - http://msdn.microsoft.com/en-us/library/cc848897(v=vs.85).aspx

No guard for older IE, since support for them will be removed soon anyway
Core: Throw an error on $("#") rather than returning 0-length collection

Closes gh-1682

Thanks @goob for the issue report!
(cherry picked from commit 80022c81ce4a07a232afd3c580b0977555a2daec)
Event: Copy detail property to jQuery.Event on native events

Fixes gh-1867
(cherry picked from commit d9ed166c865e91ccc8cef1ca282785c500ca2306)

Conflicts:
   test/unit/event.js
Misc: Drop support for older browsers; update support comments

That includes IE<8, Opera 12.x, Firefox<29, Safari<6.0 and some hacks
for old Blackberry.

Fixes gh-1836
Fixes gh-1701
Refs gh-1815
Refs gh-1820